If you want to use small-unit wargames in my never-was draft percolating of a futuristic USSR deciding to finish off a surviving Ceausescu, some basic guidelines. Obviously, it’ll depend on the exact ruleset, but here’s the basics:
Union of Soviet Sovereign Republics
The USSR, under a Sovereign Union that in real life got scuttled by the August Coup, follows the 1990s GENFORCE “Mobile Forces” concept. Which is to say a multi-tier force. The “Basic Forces” divisions resemble slightly better late Cold War ones. The Mobile Forces ones have more futuristic equipment, better body armor/night vision, and substantially better training.
Mobile Forces battalions are organically combined arms mixed. APCs/IFVs are three to a platoon with each squad having a magazine LMG and rocket launcher. Company weapons platoons have lighter ATGMs and belt/tripod GPMGs. All Mobile Forces mechanized battalions have a large number of organic 2S31s (or Nonas for less-equipped formations).
Given the terrain, mountain formations have been plucked and sent in. GENFORCE mountain brigades are a four-infantry-one-tank battalion setup with supporting equipment suited for high altitudes (ie, lighter and higher-angle artillery). They also have a separate APC battalion that can be used to motorize if the terrain is appropriate. The one historical Soviet mountain brigade was inherited by Kyrgyzstan and consisted of two BMP and two soft-skin battalions with some attached cavalry and pack animal units.
The main contributors to the Soviet effort are Bulgaria and the stabilized Afghanistan. The former mobilizes to its full ability, which means it runs the gauntlet from “1980s NSWP” to “T-34s and World War I heavy artillery” (hey, if it can shoot and make a big explosion, it’s still worth something). The latter contribute a fairly standard BTR-equipped motor rifle division and numerous commando units.
Romania has a regular army with a degree of military modernization that it lacked. While select units have SRBMs based on foreign civilian sounding rockets, bespoke grenade launchers, and more (comparably) advanced tanks like the bizarrely shaped TAA, others are bottom of the barrel. All units should be mostly low quality, but some (particularly Securitat irregulars) will have better morale than others if applicable.
Organizationally, most should resemble lower-tier eastern forces.